石英云母片岩横观各向同性强度参数试验研究

doi:10.13722/j.cnki.jrme.2017.1207

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摘要

通过劈裂试验对石英云母片岩的抗拉强度、变形模量、泊松比等各向异性参数开展研究，研发单个岩样测不同劈裂面与片理夹角下岩石抗拉强度的试验方法；根据单个岩样多次劈裂后岩样抗拉强度相对差值和方差值的大小，提出一种辨别砂岩均匀性好与差的方法。结果表明：岩样抗拉强度、拉伸弹性模量、泊松比和劈裂面与片理夹角q的变化规律如下：石英云母片岩抗拉强度随q的递增而呈线性递增规律；抗拉强度尺寸效应随q的递增而呈线性递减规律；抗拉强度各向异性程度随着岩样的高度增加而逐渐降低；当0°＜q＜50°时，拉伸模量随着q的增加而减小，而泊松比随着q的增加而增加；当50°＜q＜90°时，拉伸模量随着q的增加而增加，而泊松比随着q的增加而减小。对干燥、饱和两种状态的岩样进行了室内单、三轴试验，结果表明：石英云母片岩在在干燥及饱和状态下均属于低各向异性岩体；干燥及饱和两种状态下弹性模量、内摩擦角、黏聚力随围压的递增呈线性递增规律。

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	刘杰1
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	王连1
	李建林1
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	苑腾飞3
	颜溧洲1

关键词 ：岩石力学, 各向异性, 抗拉强度, 片理角度, 石英云母片岩

Abstract：

The tensile strength，deformation modulus，Poisson's ratio and other anisotropy parameters of quartz mica schist are studied by splitting test. A single rock specimen is designed to test the tensile strength of rock under different splitting surface and schistosity angle. According to the relative difference between the tensile strength and the variance value of the rock specimen after multiple rock fracturing，a method of distinguishing good and poor sandstone homogeneity is proposed. The results show that the variation of tensile strength，tensile modulus，Poisson¢s ratio and splitting surface and the schistosity angle q of the rock are as follows：The tensile strength of quartz mica schist increases linearly with the increase of q. The size effect of tensile strength decreases linearly with the increase of q. The anisotropic degree of tensile strength decreases as the height of the rock sample increases. When 0°＜q＜50°，the tensile modulus decreases with the increase of q，and the Poisson's ratio increases with the increase of q；When 50°＜q＜90°，the tensile modulus increases with the increase of q，and the Poisson¢s ratio decreases with the increase of q. The single and triaxial tests were carried out on the samples of dry and saturated states. The results show that the quartz mica schist in the dry and saturated state belongs to low anisotropy of rock mass；The elastic modulus，internal friction angle and cohesive force under dry and saturated condition increase linearly with the increase of confining pressure.

Key words： rock mechanics anisotropy tensile strength schistosity angle quartz mica schist

引用本文:

刘杰1，2，王连1，李建林1，2，苑腾飞3，颜溧洲1. 石英云母片岩横观各向同性强度参数试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3740-3751.
LIU Jie1，2，WANG Lian1，LI Jianlin1，2，YUAN Tengfei3，YAN Lizhou1. Experimental study on transverse isotropy strength parameter of quartz-mica schist. , 2017, 36(S2): 3740-3751.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1207 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3740

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